[time-nuts] Bad batch of HP10811's

[Jason Rabel]

Here's one for you guys...

What would the cause be when you power one up, and it seems to try to
oscillate, but then powers down (current consumption drops way down)?

Thermal fuse again or just toast?

Jason


> I'll apolgize on behalf of HP for putting in that stupid thermal
> fuse.  It cannot be soldered in for the obvious reason that the
> soldering temperature exceeds the fusing temperature.  Therefore,
> it must be socketed.  It does NOT have gold plated leads, and
> hence the reliability of the contact with the socket is poor.
> I think the reason for it was that if the oven ran away, the
> thermal foam would burn up and out-gas toxic fumes.  Ovens very
> rarely run away.
> 
> The unit that is 500 Hz off is not due to a cold oven.  There isn't
> that much tempco in the crystal.
> 
> Rick Karlquist N6RK